Lingual bar



James 5, 11923.

. 11,457,867 R. v. WILLIAMS LINGUAL BAR Filed Sept. 19 1921 Patented June 5, 1923.

ll ,Alf,

entree stares rarer er REGINALD v. WILLIAMS, or BUFFALO, new YORK, nss enoa 'ro WILLIAMS eon]:

REFINING 00., or BUFFALO, NEW YORK, A conronarron or New YORK.

LINGUAL BAR.

Application filed'september 19, 1921. Serial No. 501,740.-

To (0 E whom may concern:

Be it known that I. REGINALD V. Win Lmirs, a citizen of the United States, residing. at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Lingual Bars, of which the following is a specification.

This invention relates toan improvement in the lingual oars used in dentistry and more particularly to bars of this kind having their end portions provided with ribs or corrugations for anchoring them in the dental plate.

One of the objects of the invention is to so arrange the anchoring devices that the end portions of the bar take up a minimum space in the plate.

Another object is to improve the construction of the bar with a view of obtaining a reliable anchorage and at the same time preserving its strength.

In the accompanying drawings:

Figure 1 is a perspective view of the improved lingual bar showing one of its end portions inserted in a dental plate a frag- .nent of which is shown by dotted lines. 2 is a sectional plan view of the bar secured in the dental plate. Fig. 3 is a side elevation of the bar. Fig. 4 is a longitudinal section thereof on line 4-4, Fig. 2. Fig. 5 is a transverse section on an enlarged scale on line 55, Fig. 4. Fig. 6 is a view similar to Fig. 2, showing a modified form of the invention.

Similar characters of reference indicate corresponding parts in the several views.

The bar may be constructed of any suitable material, such as cased or solid gold, and comprises the end portions 10 connected by the customary bow or arch 11. In the preferred embodiment of the invention, each of these end portions is flat and smooth on its outer or buccal side, as shown at 12, while its inner side is provided with anchoring ribs or corrugations 13 extending practically throughout the length of the end portion and from edge to edge thereof. The corrugations are preferably of zigzag form as shown, and produced by stamping on the inner face of each end portion along its margins, two series of V-shaped depressions 14 with their apexes facing inwardly and the depressions of one series alternating with those of the other. The several depressions extend to the extreme edgesof the end portions 10 and preferably increase in depth from the longitudinal center lines of those portions toward said edges, to produce teeth or projections 15 along both edges, as shown in the drawings. teeth, together with the corrugations ex:

tending across the inner faces of the portions, securely anchor the lingual bar in the dental plate.

In the preferred form of the bar, its end portions are tapered in cross section from their longitudinal center lines toward their edges, as shown in Fig. 5, or in other words, those end portions are of diminishing thick ness toward their edges.

By flattening the end portions of the bar on one side and corrugating them on the other, they take up only about half the space of the corrugations of ordinary lingual. bars. This is an important feature, as it permits the dental plate to be made of correspondingly smaller dimensions and renders it more comfortable to the wearer. At the same time, the bar has the greatest strength where it is most required.

On account of the end portions being smooth onthe buccal side, the bar is easily adapted to the case, as most of the rubber packing is on the lingual side. While it is perferable to make said end portions flat on the buccal side and corrugated on the lingual side, as shown, I do not wish to be limited to that particular arrangement, since some of the advantages of the invention may be secured by a reversal of that arrangement, corrugations 1.3 being placed on the buccal side and the smooth faces 12 on the opposite side, as shown in Fig. 6.

While possessing the advantages hereinhefore mentioned, this improved lingual bar is no more expensive than the ordinary corrugated bars hitherto in use.

I claim as my invention:

1. A. lingual bar having end portions which are flat on one side and corrugated on the opposite side.

2. A lingual bar having end portions which are flat on their buccal sides and corrugated on their lingual sides.

3. A lingual bar provided in a side thereof with diagonal, zigzag anchoring corrugations.

4. A lingual bar having end portions These.

5. A lingual bar having end portions provided with anchoring corrugations extending from edge to edgethereof, said end portions being of diminishing thickness toward their longitudinal edges.

which are flat on one side and provided on their opposite sides with zigzag anchoring corrugations extending from "edge to edge thereofythe end portions being of tapering cross section from their intermediate por tions toward their longitudinal edges.

7. A lingual bar having an endportion provided along its margins with two series of substantially V-shaped depressions with their apexes facing inwardly, forming zigzag corrugations on the side of sai 6. A lingual bar having end portions.

zag corrugations, the depressions of one of said series alternating with those of the other series. a,

'8. A lingual bar having an end portion provided along its margins with two series of substantially \l-shaped depressions with their apeXes facing inwardly, forming portion, said depressions increasing in depth toward the edges of said end portions and forming a series of teeth along each edge thereof."

9. A lingual bar for artificial dentures tions extending therefrom, the ends of said arm portions being provided with retentive surfaces comprising'one or more series of staggered indentationa REGINALD v. WILLIAMS. 

